Question

Find the length of a rectangular field if its perimeter is 240 m and its breadth is 52m
CH-PERIMETER​

Answer 1

2(l+b) = 240

l+b = 120

l+ 52 = 120

l = 120 - 52

l = 68 cm

Answer 2

$perimeter = 2(l + b) \\ 240 = 2(52 + l) \\ \frac{240}{2} = 52 + l \\ 120 - 52 = l \\ l = 68$